Fuel injector



Aug. E6, 1966 w. L. KENNEDY, SR. 3,265,785

FUEL INJECTOR Filed April 17, .1964 5 Sheets-Sheet 1 Z WTTTTTTH 7 Aug.M, 1966 w. L. KENNEDY, SR 3,266,785

FUEL INJECTOR Filed April 17, 1964 3 Sheets-Sheet 5 INVENTOR. WALTEE AKE/V/VEDX $19 United States Patent 3,266,785 FUEL INJECTOR Walter I...Kennedy, Sn, Berkley, Mich. (6939 Rolton Court, Waterford, Mich. 48095)Filed Apr. 17, 11964, Ser. No. 360,707

14 Claims. (Cl. 261-41) This invention relates to a fuel injector forinternal combustion engines, and more particularly to an improved fuelmetering device adapted to be employed with an internal combustionengine and being of the type having idling control means responsive tothe operation of the engine.

A main object of the invention is to provide a novel and improved fuelinjection device for an internal combustion engine, the device beingrelatively simple in construction, providing accurate metering of thefuel passing therethrough, having a minimum of moving parts, beingadaptable for use with a wide range of internal combustion engines, suchas those employed in automobiles, motor trucks, marine craft, and thelike, and being provided with means to assure a continuous meteredsupply of fuel while the associated engine is idling and to cut off suchsupply when the engine is not operating.

A further object of the invention is to provide an improved fuelinjection device for an internal combustion engine arranged to providepositive accurately metered flow of fuel to the engine under idlingconditions thereof and to cut off such flow when the engine is notoperating, the device being composed of relatively inexpensive parts,being easy to install, being reliable in operation, and providingimproved engine performance as well as fuel economy. e

A still further object of the invention is to provide an improved fuelinjection device for an internal combustion engine, the device beingrelatively compact in size, being durable in construction, being easy toadjust, being substantially leakproof, and being arranged so thattransmission of fuel therethrough is automatically shut off responsiveto the stopping of the associated engine.

A still further object of the invention is to provide an improved fuelinjection device for an internal combustion engine, said device beingprovided with improved means to prevent transmission of fueltherethrough unless the associated engine is developing vacuum, wherebythe supply of fuel to the engine is automatically shut off when theengine is not running or is stalled.

Further objects and advantages of the invention will become apparentfrom the following description and claims, and from the accompanyingdrawings, wherein:

FIGURE 1 is a perspective view of an improved fuel injection deviceconstructed in accordance with the present invention, shown in normaloperating position, namely, in a position wherein the associated engineis running.

FIGURE 2 is a fragmentary vertical cross-sectional view takensubstantially on the line 2-2 of FIGURE 1.

FIGURE 3 is a transverse vertical cross-sectional view takensubstantially on the line 3-3 of FIGURE 2.

FIGURE 4 is a transverse vertical cross-sectional view taken through theintermediate portion of the butterfly valve and associated supportingstructure of the fuel injector of FIGURES 1 to 3, illustrating theapproximate position of the butterfly valve when the associated engineis shut off, with the accelerator pedal of the engine released.

FIGURE 5 is a vertical cross-sectional view taken in a longitudinalvertical plane through the vacuum-controlled idling locking cylinder ofthe fuel injector with the parts in the positions corresponding toFIGURE 4,

3,Z6fi,785 Patented August 16, 1966 namely, wit-h the associated engineinoperative and the associated accelerator linkage in a releasedposition.

FIGURE 6 is a vertical cross-sectional view similar to FIGURE 4 buttaken on the line 6-6 of FIGURE 3, namely, showing the parts inengine-idling positions. FIGURE 6a is a transverse verticalcross-sectional view taken substantially on the line 6a6a of FIGURE 3.FIGURE 7 is a fragmentary vertical cross-sectional view, similar toFIGURE 5, but showing the parts associated with the vacuum-controlledcylinder in positions corresponding to FIGURE 6.

FIGURE 8 is a vertical cross-sectional view similar to FIGURES 4 and 6but showing the butterfly valve in fully opened position providingmaximum fuel mixture transmission through the engine.

FIGURE 9 is a fragmentary vertical cross-sectional view similar toFIGURES 5 and 7, but showing the parts in positions corresponding to thecondition illustrated in FIGURE 8.

FIGURE 10 is a fragmentary end elevational view taken substantially onthe line 1910 of FIGURE 3.

FIGURE 11 i a perspective view showing the idle locking bar andassociated elements, as employed in the fuel injector of the presentinvention, the parts being shown in separated positions.

FIGURE 12 is a perspective View of a modified form of fuel meteringdevice constructed in accordance with the present invention.

FIGURE 13 is a perspective view of the metering shaft and associatedelements, a employed in the fuel metering device of the presentinvention, with the parts shown in separated positions.

FIGURE 14 is an enlarged fragmentary elevational view of the inner endportion of the metering shaft of the fuel injector device of the presentinvention.

FIGURE 15 is a bottom plan View of the butterfly shaft takensubstantially on the line 1515 of FIG- URE 8.

Referring to the drawings, and more particularly to FIGURES l to ll, 13,14 and 15, 16 generally designates an improved fuel injection deviceaccording to the present invention. The main body of the device 11 isdesignated at 17, and the butterfly valve thereof is designated at 18.The butterfly valve 18 has an integral sleeve-like mounting portion 19which is fixedly secured on a hollow supporting sleeve 20 which extendsrotatably through a horizontal bore 21 in a side wall of the body 17 andto the outer end portion of which is secured the operating arm 22 whichis connected by conventional linkage means to the accelerator pedal ofthe associated vehicle, the arm 22 being biased in a clockwisedirection, as viewed in FIGURE 1, by the conventional biasing springmeans associated with the connecting linkage between the acceleratorpedal and the shaft 20. When the accelerator pedal is depressed, the arm22 is rotated counterclockwise, as viewed in FIGURE 1, namely in anupward direction, to similarly rotate shaft 20 counterclockwise againstthe biasing force of the accelerator linkage spring means.

Secured on the external portion of hollow shaft 24) inwardly adjacentthe arm 22 is a control arm, designated generally at 23, said controlarm being generally L- shaped and having the respective finger portions24 and 25 extending at right angles to each other. The finger 25 is ofsubstantial length and is located so as to engage a fixed stopprojection 26 integrally formed on the lower portion of body 17 to limitthe counterclockwise rotation of the hollow shaft 20, as viewed inFIGURE 1, to a position corresponding to that illustrated in FIG- URE 8,wherein the butterfly member 18 is in a substantially vertical position,allowing maximum fluid flow through the fuel injector body 17. Thisrepresents the full throttle conditions of the fuel injector device,whereas FIGURE 4 shows the butterfly member 18 in its normal positionwherein the associated engine is not operating.

The finger member 24 is provided with the adjustable idling abutmentscrew 27 which is threadedly engaged through the member 24 and extendsparallel to the finger 25, the end of the screw 27 being engageable withan arcuately curved stop flange 28 formed on the end of a lock bar 29.The lock bar 29 is supported horizontally and is slidably connected tothe main body 17 by a retaining screw 30 which extends through thecentral aperture of a guide plate 31 and a longitudinal slot 32 formedin bar 29, the screw 30 being threadedly engaged in a tapped hole 33provided in a guide recess 34 formed in the wall of body 17, as shown inFIGURE 11. The recess 34 is shaped to slidably receive the bar 29 and toguide the bar horizontally, cooperating with the screw 30 and the slot32 to allow horizontal movement of bar 29 relative to body 17, themovement being limited by the slot 32. The plate 31 is provided with afinger 35 projecting at right angles to the plate 31 and slidablyengaging in another longitudinal slot 36 formed in the bar 29. Thefinger 35 is provided with a projection 37 engaging in one end of abiasing coiled spring 38, the other end of the coiled spring engagingover a projection 39 formed in the opposite end edge of slot 36. Thusthe coiled spring 38 exerts a biasing action on the bar 29 urging saidbar to the left, as viewed in FIGURE 11, namely, in a direction to causethe flange 28 to bias arm 23 and shaft 20 in a counterclockwisedirection, as viewed in FIGURE 1, in opposition to the bias exerted onarm 22 by the spring means associated with the accelerator linkagesystem. However, under ordinary conditions the clockwise bias on the arm22 is much stronger than and overcomes the biasing force exerted by thespring 38.

Formed rigidly with the body 17 is a vertical cylinder 40 containing apiston 41 having the upwardly projecting piston rod 42 which is formedwith a vertical slot 43 slidably receiving the bar 29, as shown inFIGURE 2. The cylinder 40 is provided with a top wall 44 formed with acentral bore through which the rod 42 slidably extends, said top wall 44limiting the upward movement of the piston 41, for example, to theposition shown in FIGURE 5. A coiled spring 45 is provided below thepiston 41, the top end of the spring being received in a recess 46formed in the bottom of piston 41, and the lower end of the springbearing on the bottom wall of cylinder 40, as is clearly shown in FIGURE2. The piston 41 is thus biased upwardly toward the position shown inFIGURE 5 wherein said piston is in its uppermost limiting positionengaging the top wall 44.

A detent screw 46 is threadedly engaged through the top of the piston42, extending downwardly into the slot 43 and being lockingly engageablein a notch 47 formed in the top edge of the bar 29. The cylinder 40 isprovided at its lower end portion with a connection conduit 48 which isconnected to the intake manifold of the associated internal combustionengine so that the cylinder will be evacuated by the vacuum created insaid intake manifold when the engine is operating, causing the piston 41to be lowered against the force of the biasing spring 45. Under theseconditions, illustrated in FIG- URE 2, the screw 46 engages in the notch47, locking the bar 29 against horizontal sliding movement. When bar 29is thus locked, the screw 27 abuts against the frame 28, holding theshaft 20 in a predetermined position, illustrated in FIGURES 6 and 7,the clockwise biasing force on the arm 22 being insufficient to overcomethe locking action provided by the vacuum in cylinder 40, which holdsthe screw 46 in locking engagement in the notch 47. As will be presentlyexplained, the condition 4 illustrated in FIGURES 6 and 7 represents theidling position of'the fuel injector device 16, whereas the conditionillustrated in FIGURES 4 and 5 represents the cutoff position of thefuel injector device.

As shown in FIGURE 2, the arm 23 is secured on the hollow shaft 20 bythe provision of a clamping arm 49 provided with a clamping screw 50which extends through the arm 49 and is threadedly engaged in the fingerportion 24, these elements defining a split collar whereby the member 23may be adjustably secured on the hollow shaft 20.

As shown in FIGURE 3, the butterfly valve supporting sleeve 19 has itsleft end in engagement with a resilient deformable sealing ring 51received in an annular recess 52', definining a counterbore around theinner end portion of the bore 21 in the Wall of body 17, the oppositeend of the sleeve 19 engaging against an enlarged annular head member 52integrally formed with the hollow shaft 20, the head member 52 beingformed with a V-shaped radial groove 56 at its inner surface whichreceives a correspondingly shaped locking projection 54' formed on theend of the sleeve 19. The head 52 is provided with the frusto conicaloutwardly flaring outer sealing surface 54 which is sealingly androtatably engaged by a correspondingly shaped frusto conical surface 55provided on the enlarged head portion 56 of a metering shaft member,generally designated at 57. The head member 52 of hollow shaft 20 andthe head member 56 of metering shaft i 57 are rotatably received in ahorizontal sleeve portion 58 formed integrally with the body 17 andprovided with a snap ring recess 59 at its outer end portion in which ispositioned a snap ring 60. The head member 56 is formed with the reducedend portion 61 which extends outwardly through the sleeve 58 and whichthereby defines an inner annular shoulder 62. A coiled spring 63surrounds the portion 61, bearing between shoulder 62 and a bearingwasher 64 which abuts the snap ring 59. The spring 63 thus exerts aninward biasing force on the member 57, urging the frusto conical surface55 against the cooperating frusto conical sealing surface 54, as well asurging the hollow shaft 20 leftwards, as viewed in FIGURE 3.

A positioning collar 65 is clampingly secured on the outer end portionof the cylindrical member 61, said positioning collar being providedwith an outwardly projecting lug 66. The body 17 is integrally formedwith a pair of vertically spaced opposing arms 67 and 68 locatedrespectively above and below the projection 66, and respective verticalpositioning screws 69 and 70 are threadedly engaged through the arms 67and 68 and extend into engagement with opposite side portions of thelugs 66, whereby the metering shaft 57 may be held in rotated adjustedposition around the axis of the sleeve 58. The frusto conical surface 55of head member 56 is provided with a circumferentially tapering meteringrecess 71 whose position may thus be angularly adjusted.

The outer end portion of cylindrical member 61 is formed with aninternally threaded bore 72 in which is engaged the fuel supplyconnection fitting 73 which is in turn connected to the fuel supplyconduit 74, as shown in FIGURE 10. The head member 56 is provided with apassage 75 connecting the fuel supply connection recess 72 to the largerend of the metering recess 71.

The f-msto conical sealing surface 54 is provided with an inwardlyflaring tapered recess 76 whose smaller end portion is located tooverlap with the tapering metering recess 71. iT he inner end of recess76 communicates with an annular groove 77 formed at the inner portion ofthe frusto conical surface 54, as shown in FIGURE 13.

The metering shaft member 57 is formed with the reduced axiallyextending inner sleeve portion 78 provided with the longitudinallyextending recess 79 communicating at its rear end with the annulargroove 77, the forward end portion of the sleeve 77 being provided atthe forward end of the groove 79 with an aperture 80 communicativelyconnecting the groove 79 with the interior of sleeve memher 78. Thesleeve member 78 has shown at 81, which acts as a bearing a coiledspring 82. The forward end her 78 is notched away, as shown at 83, 813,todefine a forwardly and upwardly inclined bearing seat for awedgeshaped sleeve segment 84 fitting in the notched seat defined by theelements 83, 83 and having the same curvature as the sleeve member 78.Wedge segment 84 is provided with a bearing shoulder '85 against whichthe forward end of spring 82 engages, urging the wedge member 84forwardly, namely, to the right, as viewed in FIGURES 13 and 14. Due tothe inclination of the opposite notched edges 83, 83, the biasing forceof spring 812 urges the wedge element 84 outwardly into sealingengagement with the inside bore surface of sleeve 20, providing sealingcontact of the member 8 4- with said inside bore surface while allowingthe sleeve to rotate relative thereto.

Wedge member 84 is formed with a generally triangular external recess 86which registers with the forward portion of the groove 79. T he hollowwith a longitudinal slot 187 which registers with a series of apertures88 formed in the sleeve 19, leading to a channel-shaped longitudinallyextending discharge nozzle 89 formed integrally on the sleeve member'19, the registering slot 19-7 and apertures 88 being rotatable intoregistry with the triangular recess 86 to provide injection of fuel intothe interior :bore of body 17 as the butterfly valve 18 is rotated in acounterclockwise direction from the position of FIGURE 6 toward theposition of FIGURE 8. Since the apertures 88 are arrangedlongitudinally, an increasing number of these apertures are exposed tothe recess 86 as the butterfly valve 18 is rotated counterclockwise fromthe position of FIGURE 6 toward the position of FIGURE 8, due to thetriangular shape of recess 8-6. This provide a progressive increase inthe supp-1y of fuel a sthe butterfly valve '18 is rotated from theidling position of FIGURE 6 toward the full throttle position of FIG-URE 8.

An idling sleeve member 90 is threadedly secured inside the hollow shaft20, the idling sleeve 90 being formed with an interior bore 91terminating in a frusto conical needle valve seat 92 defining a needlevalve aperture communicating with the interior of the sleeve member 78.Idling sleeve 90 has a discharge aperture 93 communicating withregistering idle apertures 94, 94 provided in sleeve members 19 and 29to allow liquid fuel from the interior of sleeve 78 to discharge intothe interior bore of body 17 to provide fuel for engine idling. Anadjustable needle valve element 96 is threadedly engaged in the bore 91,said valve element having an exposed adjusting head 97, whereby theclearance between the tip of the valve element 96 and the seat 92 may beadjusted to provide a desired rate of flow of idling fuel. It will benoted however, that there will be no flow of fuel for a solid rear wall,as seat for one end of portion of the memidling unless some degree ofregistry exists between recess 76 and recess 71.

Under normal conditions with the engine shut off, the positions of theparts are those illustrated in FIGURES 4 and 5. Under these conditionsthe narrow end of the outwardly tapering recess 76 does not overlap thenarrow end of the circumferentially tapering recess 71 so that fuelcannot flow into the sleeve 28 and therefore no fuel can be delivered tothe interior of the body 17. The arm 22 is held in a clockwise rotatedposition by the accelerator linkage rod 98 under a force of theaccelerator linkage biasing spring 99, as shown in FIGURE 5, the end ofthe screw 27 abutting the laterally extending projection 28, but theforce of the accelerator linkage biasing spring 99 being substantiallygreater than that of the force of thelocking rod biasing spring 38. Whenthe operator steps on the accelerator pedal, the linkage rod 98 movesupwardly from the position of FIGURE 5, rotating the arm 22 in acounterclockwise direction, as viewed in FIGURES 5 and 7, stretching thespring 99 and rotating the butterfly valve through the position of FIG-shaft 20 is provided a 6 URE 6 toward the full throttle position ofFIGURE 8. Until the engine starts, the spring 45 holds the piston 41 inan elevated position, as shown in FIGURE 5, but as soon as the enginebegins to operate, vacuum develops in the intake manifold thereof, whichis transmitted to the interior of the cylinder 40, causing the piston 41to be drawn downwardly so that the lower end of locking screw 46 engagesthe top edge of locking rod 29. The spring 38 exerts a biasing force onthe locking rod 29 which moves it to the left from the position ofFIGURE 5 until the locking screw 46 engages in the notch 47, whereuponthe rod 29 is held in the position of FIGURE 7, so that thereafter whenthe accelerator pedal is released with the engine running the arm 22 islimited in its clockwise rotation to the position shown in FIGURE 7because of the engagement of the screw 27 with the laterally extendingprojection 28 on the end of the locking rod 29. In this position, asshown in FIGURE 6, the narrow end of the outwardly tapering, radiallyextending recess 76 overlaps the narrow end of the circumferentiallytapering recess 71, allowing a sufficient amount of fuel to flow intothe sleeve 20 by way of the groove 79 and thence by way of the aperture80, the interior of sleeve 78, past the tip of needle valve 96 in seat92, through bore 91 and through passages 93 and 94, 94' into thedischarge channel-shaped space 89 into the interior of body 17 to allowengine idling. The bar 29 will remain locked in the position of FIGURE 7as long as the engine continues to operate, namely, as long as vacuum ispresent in the cylinder 40. Thus, when the butterfly valve 18 is rotatedtoward the full throttle position of FIGURE 8, the bar 29 still remainslocked in the same position as shown in FIGURE 7, namely, in theposition providing subsequent idling of the engine if the acceleratorpedal is released. This is illustrated in FIGURE 9, wherein the arm 22is shown elevated by the link 98 to a position corresponding to the fullopening position of the butterfly valve 18, shown in FIGURE 8. Underthese conditions the finger 25 engages against the fixed stop lug 26provided in the lower portion of main body 17.

As will be readily apparent, the position of the metering shaft 57 canbe accurately adjusted by means of the positioning screws 69 and 70which engage the lug 66 on collar 65. The idling position of thebutterfly valve 18 can be regulated by adjusting the screw 27. Theamount of idling fuel supplied to the interior of the body 17 underidling positions can be further adjusted to an accurate degree byadjusting the needle valve element 96. by means of its externalactuating head 97.

Since only a relatively small degree of vacuum is required in thecylinder 40 to hold the piston 41 in a depressed locking condition,fluctuation of the vacuum in the cylinder does not affect the retentionof the locking bar 29 in the position shown in FIGURES 7 and 9.Furthermore, such fluctuations of the vacuum do not affect thedistribution of the fuel through the overlapping recesses 76 and 71 andthrough groove 79, recess 86 and apertures 88, since this is controlledonly by the action of the accelerator linkage connected to the arm 22.

Whenever the engine is cut off or stops for any reason, the vacuum nolonger exists in cylinder 40, allowing spring 45 to elevate piston 41,thereby unlocking the bar member 29. The accelerator linkage biasingspring 99 then causes the butterfly valve 18 to rotate to the posi tionof FIGURE 4, limited by the engagement of the screw 27 with thelaterally extending projection 28 on bar 29. The recess 76 is moved outof communication with the recess 71, cutting off the supply of fuel.Thus, the supply of idling fuel is automatically discontinued wheneverthe engine is stopped or becomes stalled for any reason.

In the form of the invention shOWn in FIGURE 12, the locking bar, shownat 29 has a laterally extending projection 28' engageable by theadjustable screw 27 on finger 24, as in the previously described form ofthe 7 invention. The main body, shown at 17 is provided at one end ofits base with an upstanding flange 100 on which is mounted a vacuumchamber 101 containing a flexible diaphragm of conventionalconstruction. Connected to said diaphragm is an outwardly extending arm102 which is received in a longitudinal slot 103 formed in the end ofrod 29' and which is pivotally connected thereto by a transverseconnecting pin 104. The inside of the vacuum chamber communicates with ahousing 105 which in turn is connected by means of a conduit 106 to thelower portion of the interior of body 17, so that it is in communicationwith the intake manifold and is thus exposed to the vacuum developedtherein when the engine operates. When such vacuum is developed, thediaphragm in the chamber 101 flexes to pull the arm 102 to the left, asviewed in FIGURE 12, moving the bar 29' also to the left and carryingthe laterally extending projection 28' therewith. As long as theprojection 28 is held in its leftward position by the presence of vacuumin the chamber 101, the butterfly valves and parts connected therewithare held in idling positions, namely, in positions wherein the narrowend portions of the recesses 76 and 71 overlap, allowing the flow offuel into the interior of body 17 to maintain idling. The vacuum chamber101 is relatively large in size so that only a small amount of vacuum isrequired to maintain the bar 29 in a leftward retracted position, sothat, just as in the previously described form of the invention,fluctuation of the vacuum will not interfere with holding the bar 29' ina position to insure supply of idling fuel as long as the engine isrunning.

While certain specific embodiments of an improved fuel injector havebeen disclosed in the foregoing description, it will be understood thatvarious modifications within the spirit of the invention may occur tothose skilled in the art. Therefore, it is intended that no limitationsbe placed on the invention except as defined by the scope of theappended claims.

What is claimed is:

1. A fuel injection device comprising a main body formed with a passagefor fuel mixture, a metering shaft mounted in a wall of said main bodyand projecting into said passage, said metering shaft having an innerportion formed with a discharge recess, a sleeve-like butterfly shaftrotatably mounted on said inner portion and having discharge aperturesregistrable with said discharge recess, said metering shaft having anannular face formed with a circumferentially tapering metering recess,said butterfly shaft having an annular face sealingly engaging saidfirst-named annular face and formed with a fuel-receiving recess locatedto overlap said metering recess, passage means communicativelyconnecting said fuel-receiving recess to said discharge apertures, fuelinlet means communicatively connected to said metering recess, meansbiasing said butterfly shaft to a position wherein said fuel-receivingrecess is out of registry with said metering recess, means to rotatesaid butterfly shaft to an idling position wherein said fuel-receivingrecess overlaps a relatively narrow portion of said metering recess, andvacuum-responsive means to lock said butterfly shaft in said idlingposition.

2. A fuel injection device comprising a main body formed with a passagefor fuel mixture, a metering shaft mounted in a wall of said main bodyand projecting into said passage, said metering shaft having an innerportion formed with a discharge recess, a sleeve-like butterfly shaftrotatably mounted on said inner portion and having discharge aperturesregistrable with said discharge recess, said metering shaft having anannular face formed with a circumferentially tapering metering recess,said butterfly shaft having an annular face sealingly engaging saidfirst-named annular face and formed with a fuelreceiving recess loctedto overlap said metering recess, passage means communicativelyconnecting said fuelreceiving recess to said discharge apertures, fuelinlet means communicatively connected to said metering recess, meansbiasing said butterfly shaft to a position wherein said fuel-receivingrecess is out of registry with said metering recess, means to rotatesaid butterfly shaft to an idling position wherein said fuel-receivingrecess overlaps a relatively narrow portion of said metering recess, alocking bar slidably mounted in said main body, an abutment element onsaid butterfly shaft, a projection on said locking bar engageable withsaid abutment element, and vacuum-responsive means engageable with saidlocking bar to lock said butterfly shaft in said idling position.

3. A fuel injection device comprising a main body formed with a passagefor fuel mixture, a meeting shaft mounted in a wall of said main bodyand projecting into said passage, said metering shaft having an innerportion formed with a discharge recess, a sleeve-like butterfly shaftrotatably mounted on said inner portion and having discharge aperturesregistrable with said discharge recess, said metering shaft having anannular face formed with a circumferentially extending metering recess,said butterfly shaft having an annular face sealingly engaging saidfirst-named annular face and formed with a fuel-receiving recess locatedto overlap said metering recess, passage means communicativelyconnecting said fuel-receiving recess to said discharge apertures, fuelinlet means communicatively connected to said metering recess, meansbiasing said butterfly shaft to a position wherein said fuel-receivingrecess is out of registry with said metering recess, means to rotatesaid butterfly shaft to an idling position wherein said fuel-receivingrecess overlaps a portion of said metering recess, a locking barslidably mounted on said main body, an abutment element on saidbutterfly shaft, a projection on said locking bar engageable with saidabutment element, said locking bar being formed with a detent notch, anda vacuumresponsive element lockingly engageable in said detent notch andlocated to hold the locking bar in a position wherein said projectionholds the butterfly shaft in said idling position.

4. A fuel injection device comprising a main body formed with a passagefor fuel mixture, a metering shaft mounted in a wall of said main bodyand projecting into said passage, said metering shaft having an innerportion formed with a discharge recess, a sleeve-like butterfly shaftrotatably mounted on said inner portion and having discharge aperturesregistrable with said discharge recess, said metering shaft having anannular face formed with a circumferentially extending rnetering recess,said butterfly shaft having an annular face sealingly engaging saidfirst-named annular face and formed with a fuel-receiving recess locatedto overlap said metering recess, passage means communicatively connectedsaid fuel-receiving recess to said discharge apertures, fuel inlet meanscommunicatively connected to said metering recess, means biasing saidbutterfly shaft to a position wherein said fuel-receiving recess is outof registry with said metering recess, means to rotate said butterflyshaft to an idling position wherein said fuel-receiving recess overlapsa portion of said metering recess, a locking bar slidably mounted onsaid main body, an abutment element on said butterfly shaft, aprojection on said locking bar engageable with said abutment element,said locking bar being formed with a detent notch, a cylinder secured tosaid body, a piston in said cylinder, and means on the piston lockinglyengageable in said detent notch and located to hold the locking bar in aposition wherein said projection holds the butterfly shaft in saididling position responsive to vacuum in said cylinder.

5. A fuel injection device comprising a main body formed with a passagefor fuel mixture, a metering shaft mounted in a wall of said main bodyand projecting into said passage, said metering shaft having an innerportion formed with a discharge recess, a sleeve-like butterfly shaftrotatably mounted on said inner portion and having discharge aperturesregistrable with said discharge recess, said metering sha-ft having anannular face formed with a circumferentially extending metering recess,said butterfly shaft having an annular face sealingly engaging saidfirst-named annular face and formed with a fuelreceiving recess locatedto overlap said metering recess, passage means communicativelyconnecting said fuel-receiving recess to said discharge apertures, fuelinlet means communicatively connected to said metering recess, meansbiasing said butterfly shaft to a position wherein said fuel-receivingrecess is out of registry with said metering recess, means to rotatesaid butterfly shaft to an idling position wherein said fuel-receivingrecess overlaps a portion of said metering recess, a locking barslidably mounted on said main body, an abutment element on saidbutterfly shaft, a projection on said locking bar engageable with saidabutment element, said locking bar being formed with a detent notc'h, avacuum cylinder secured to said body, a piston in said cylinder, saidpiston having a slotted piston shaft slidably receiving said lockingbar, and a projection in said piston shaft lockingly engageable in saiddetent notch responsive to movement of the piston produced by vacuum inthe cylinder, said detent notch being located so that said projectionholds the butterfly shaft in said idling position when the projection inthe piston engages in said detent notch.

6. A fuel injection device comprising a main body formed with a passagefor fuel mixture, a metering shaft mounted in a wall of said main :bodyand projecting into said passage, said metering shaft having an innerportion formed with a discharge recess, a sleeve-like butterfly shaftrotatably mounted on said inner portion and having discharge aperturesregistrable with said discharge recess, said metering shaft having anannular face formed with a ciroumferentially extending metering recess,said butterfly shaft having an annular face sealingly engaging saidfirst-named annular face and formed with a fuelreceiving recess locatedto overlap said metering recess, passage means communicativelyconnecting said fuel-receiving recess to said discharge apertures, fuelinlet means communicatively connected to said metering recess, meansbiasing said butterfly shaft to a position wherein said fuel-receivingrecess is out of registry with said metering recess, means to rotatesaid butterfly shaft to an idling position wherein said fuel-receivingrecess overlaps a portion of said metering recess, a locking barslidably mounted on said main body, a laterally extending projection onsaid locking bar, an adjustable abutment screw on said butterfly shaftlocated to engage said laterally extending projection, andvacuum-responsive means lockingly engageable with said locking bar andlocated to hold said locking bar in a position wherein said butterflyshaft is held in said idling position.

7. A fuel injection device comprising a main body formed with a passagefor fuel mixture, a metering shaft mounted in a wall of said main bodyand projecting into said passage, said metering shaft having an innerportion formed with a discharge recess, a sleeve-like butterfly shaftrotatably mounted on said inner portion and having discharge aperturesregistrable with said discharge recess, said metering shaft having anannular face formed with a circumferentially extending metering recess,said butterfly shaft having an annular face sealingly engaging saidfirst-named annular face and formed with a fuel-receiving recess locatedto overlap said metering recess, passage means communicativelyconnecting said fuel-receiving recess to said discharge-apertures, fuelinlet means communicatively connected to said metering recess, meansbiasing said butterfly shaft to a position wherein said fuelreceivingrecess is out of registry with said metering recess, means to rotatesaid butterfly shaft to an idling position wherein said fuel-receivingrecess overlaps a portion of said metering recess, a locking barslidably mounted on said main body, a laterally extending projection onsaid locking bar, an arm secured to said butterfly shaft adjacent saidlaterally extending projection, an abutment screw threadedly mounted insaid arm and being engageable with said laterally extending projection,and vacuumresponsive means to releasably hold the locking bar in aposition wherein said butterfly shaft is held in said idling position.

8. A fuel injection device comprising a main body formed with a passagefor fuel mixture, a metering shaft mounted in a wall of said main bodyand projecting into said passage, said metering shaft having an innerportion formed with a discharge recess, a sleeve-like butterfly shaftrotatably mounted on said inner portion and having discharge aperturesregistrable with said discharge recess, said metering shaft having anannular face formed with a circumferentially extending metering recess,said butterfly shaft having an annular face sealingly engaging saidfirst-named annular face and formed with a fuel-receiving recess locatedto overlap said metering recess, passage means communicativelyconnecting said fuel-receiving recess to said discharge apertures, fuelinlet means communicatively connected to said metering recess, meansbiasing said butterfly shaft to a position wherein said fuelreceivingrecess is out of registry with said metering recess, means to rotate thebutterfly shaft to an idling position wherein said fuel-receiving recessoverlaps a portion of said metering recess, a locking bar slidablymounted on said main body, a laterally extending projection on saidlocking bar, an arm secured to said butterfly shaft adjacent saidlaterally extending projection, an abutment screw threadedly mounted insaid arm and being engageable with said laterally extending projection,and a vacuum-responsive member operatively engaged with said locking barto releasably hold said locking bar in position wherein said butterflyshaft is held in said idling position.

9. A fuel injection device comprising a main body formed with a passagefor fuel mixture, a metering shaft mounted in a wall of said main bodyand projecting into said passage, said metering shaft having an innerportion formed with a discharge recess, a sleeve-like butterfly shaftrotatably mounted on said inner portion and having discharge aperturesregistrable with said discharge recess, said metering shaft having anannular face formed with a circumferentially extending metering recess,said butterfly shaft having an annular face sealingly engaging saidfirst-named annular face and formed with a fuel-receiving recess locatedto overlap said metering recess, passage means communicativelyconnecting said fuel-receiving recess to said discharge apertures, fuelinlet means communicatively connected to said metering recess, meansbiasing said butterfly shaft to a position wherein said fuelreceivingrecess is out of registry with said metering recess, means to rotatesaid butterfly shaft to an idling position wherein said fuel-receivingrecess overlaps a portion of said metering recess, a locking barslidably mounted on said main body, a laterally extending projection onsaid locking bar, an arm secured to said butterfly shaft adjacent saidlaterally extending projection, an abutment screw threadedly mounted insaid arm and being engageable with said laterally extending projection,said locking bar being formed with a detent notch, and avacuumresponsive member lockingly engageable in said detent notch andbeing located to releasably hold said locking bar in a position whereinsaid butterfly shaft is held in said idling position.

10. A fuel injection device comprising a main body formed with a passagefor fuel mixture, a metering shaft mounted in a wall of said main bodyand projecting into said passage, said metering shaft having an innerportion formed with a discharge recess, a sleeve-like butterfly shaftrotatably mounted on said inner portion and having a discharge apertureregistrable with said discharge recess, said metering shaft having anannular face formed with a circumferentially extending metering recess,said butterfly shaft having an annular face sealingly engaging saidfirstnamed annular face and formed with a fuel-receiving recess locatedto overlap said metering recess, passage means communicativelyconnecting said fuel-receiving recess to said discharge aperture, fuelinlet means communicatively connected to said metering recess, meansbiasing said butterfly shaft to a position wherein said fuelreceivingrecess is out of registry with said metering recess, means to rotatesaid butterfly shaft to an idling position wherein said fuel-receivingrecess overlaps a portion of said metering recess, a locking barslidably mounted on said main body, a laterally extending projection onsaid locking bar, an arm secured to said butterfly shaft adjacent saidlaterally extending projection, an abutment screw threadedly mounted insaid arm and being engageable with said laterally extending projection,said locking bar being formed with a detent notch, a vacuum cylindersecured to said body, a piston in said cylinder, and a locking elementon said piston lockingly engageable in said notch, said locking elementbeing located so that when it is engaged in said notch the locking baris held in a position such that said laterally extending projectionholds the butterfly shaft in said idling position.

11. A fuel injection device comprising a main body formed with a passagefor fuel mixture, a metering shaft mounted in a wall of said main bodyand projecting into said passage, said metering shaft being formed witha discharge recess, a butterfly shaft rotatably mounted on said meteringshaft and having a discharge aperture registrable with said dischargerecess, said metering shalft having an annular face formed with ametering recess, the butterfly shaft having an annular face sealinglyengaging said first-named annular face and formed with a fuel-receivingrecess located to overlap said metering recess, passage meanscommunicatively connecting said fuel-receiving recess to said dischargeaperture, fuel inlet means communicatively connected to said meteringrecess, means biasing said butterfly shaft to a position wherein saidfuel-receiving recess is out of registry with said metering recess,means to rotate said butterfly shaft to an idling position wherein saidfuel-receiving recess overlaps a portion of said metering recess, andvacuum-responsive means to lock said butterfly shaft in said idlingposition.

12. A fuel injection device comprising a main body formed with a passagefor fuel mixture, a metering shaft mounted in a wall of said main bodyand projecting into said passage, said metering shaft being formed witha discharge recess, a butterfly shaft rotatably mounted on said meteringshaft and having a discharge aperture registrable with said dischargerecess, said metering shaft having an annular face formed with ametering recess, said butterfly shaft having an annular face sealinglyengaging said firstnamed annular face and formed with a fuel-receivingrecess located to overlap said metering recess, passage meanscommunicatively connecting said fuel-receiving recess to said dischargeaperture, fuel inlet means communicatively connected to said meteringrecess, means biasing said butterfly shaft to a position wherein saidfuel-receiving recess is out of registry with said metering recess,means to rotate said butterfly shaft to an idling position wherein saidfuel receiving recess overlaps a portion of said metering recess, alocking bar slidably mounted on said main body, a laterally extendingprojection on said locking bar, an arm secured to said butterfly shaftadjacent said laterally extending projection, an abutment screwthreadedly mounted on and being engageable with said laterally extendingprojection, and vacuum-responsive means to releasably hold Said lockingbar in a position wherein said butterfly shaft is held in said idlingposition.

13. A fuel injection device comprising a main body formed with a passagefor fuel mixture, a metering shaft mounted in a wall of said main bodyand projecting into said passage, said metering shaft being formed witha discharge recess, a butterfly shaft rotatab-ly mounted on saidmetering shaft and having a discharge aperture registrable with saiddischarge recess, said metering shaft having an annular face for-medwith a metering recess, said butterfly shaft having an annular facesealingly engaging said first-named annular face and formed with afuel-receiving recess located to overlap said metering recess, passagemeans communicatively connecting said fuel-receiving recess to saiddischarge aperture, fuel inlet means communicatively connected to saidmetering recess, means biasing said butterfly shaft to a positionwherein said fuel-receiving recess is out of registry with said meteringrecess,

means to rotate said butterfly shaft to an idling position,

wherein said fuel-receiving recess overlaps a portion of said meteringrecess, a locking bar slida'bly mounted on said main body, an abutmentelement on said butterfly shaft, a projection on said locking barengageable with said abutment element, and vacuum-responsive meansengageable with said locking bar to lock said butterfly shaft in saididling position.

14. A fuel injection device comprising a main body formed with a passagefor fuel mixture, a metering shaft mounted in a wall of said main bodyand projecting into said passage, said metering shaft being formed witha discharge recess, a butterfly shaft rotatably mounted on said meteringshaft and having a discharge aperture registrable with said dischargerecess, said metering shaft having an annular face formed with ametering recess, said butterfly shaft having an annular face sealinglyengaging said first-named annular face and formed with a fuel-receivingrecess located to overlap said metering recess, passage meanscommunicatively connecting said fuel-receiving recess to said dischargeaperture, fuel inlet means communicatively connected to said meteringrecess, means biasing said butterfly shaft to a position wherein saidfuel-receiving recess is out of registry with said metering recess,means to rotate said butterfly shaft to an idling position wherein said[fuel-receiving recess overlaps a portion of said metering recess, alocking bar slidably mounted on said main body, a laterally extendingprojection on said locking bar, an arm secured to said butterfly shaftadjacent said laterally extending projection, an abutment screwthreadedly mounted in said arm and being engageable with said laterallyextending projection, said locking bar being formed with a detent notch,a vacuum cylinder secured to said body, a piston in said cylinder, and alocking element on said piston lockingly engageable in said notch, saidloo-king element being located so that when it is engaged in said notchthe locking bar is held in a position such that said laterally extendingprojection holds the butterfly shaft in said idling position.

References Cited by the Examiner UNITED STATES PATENTS 1,839,102 12/1931 Kessel 26-1-44 X 2,995,349 8/1961 Kennedy 26 141 3,006,620 10/1961Cybart 26l50 3,026,095 3/ 1962 Trammell et al 261-41 HARRY B. THORNTON,Pr mary Examiner.

T. R. MILES, Assistant Examiner.

1. A FUEL INJECTION DEVICE COMPRISING A MAIN BODY FORMED WITH A PASSAGEFOR FUEL MIXTURE, A METERING SHAFT MOUNTED IN A WALL OF SAID MAIN BODYAND PROJECTING INTO SAID PASSAGE, SAID METERING SHAFT HAVING AN INNERPORTION FORMED WITH A DISCHARGE RECESS, A SLEEVE-LIKE BUTTERFLY SHAFTROTATABLY MOUNTED ON SAID INNER PORTION AND HAVING DISCHARGE APERTURESREGISTRABLE WITH SAID DISCHARGE RECESS, SAID METERING SHAFT HAVING ANANNULAR FACE FORMED WITH A CIRCUMFERENTIALLY TAPERING METERING RECESS,SAID BUTTERFLY SHAFT HAVING AN ANNULAR FACE SEALINGLY ENGAGING SAIDFIRST-NAMED ANNULAR FACE AND FORMED WITH A FUEL-RECEIVING RECESS LOCATEDTO OVERLAP SAID METERING RECESS, PASSAGE MEANS COMMUNICATIVELYCONNECTING SAID FUEL-RECEIVING RECESS, TO SAID DISCHARGE APERTURES, FUELINLET MEANS COMMUNICATIVELY CONNECTED TO SAID METERING RECESS, MEANSBIASING SAID BUTTERFLY SHAFT TO A POSITION WHEREIN SAID FUEL-RECEIVINGRECESS IS OUT OF REGISTRY WITH SAID METERING RECESS, MEANS TO ROTATESAID BUTTERFLY SHAFT TO AN IDLING POSITION WHEREIN SAID FUEL-RECEIVINGRECESS OVERLAPS A RELATIVELY NARROW PORTION OF SAID METERING RECESS, ANDVACUUM-RESPONSIVE MEANS TO LOCK SAID BUTTERFLY SHAFT IN SAID IDLINGPOSITION.